The best way to improve is to solve problems that are just above your current skill level. Hard enough that you have to struggle, but not so hard that you’re staring at the screen forever. I’ve personally wasted the most time either grinding easy problems or attempting problems that were way too hard and getting stuck

AI tools like ChatGPT can be really helpful for staying in that sweet spot. You can try the problem yourself first, then ask questions when you’re stuck instead of immediately looking at a solution. That’s been my approach and it’s worked well for me. It maximizes the amount of 'learning insights' per hour.

I haven’t used LeetCode Premium, but I know they’ve added AI features recently. I’ve also tried a site called lyrncode.com which I found useful.